Nutrivival Thyroid Energy is a complete nutritional supplement for the support of a healthy thyroid gland. Nutrivival has combined Iodine and Tyrosine, the two constituents necessary for the synthesis of thyroid secretions. The minerals Selenium, Zinc and Copper have been added as cofactors needed for normal thyroid function. In addition, Nutrivial Thyroid Energy has the Ayurveda herbal extracts from Guggul and Ashwagandha to complement its nutritional support components. Natural color variation may occur in this product.